> For the complete documentation index, see [llms.txt](https://atomico.gitbook.io/doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://atomico.gitbook.io/doc/guides/atomico-with-typescript/meta-types/declare-meta-types-to-the-component.md).

# Event declaration

Atomico supports through the use of the Host type, the declaration of **events** and [**methods**](/doc/guides/atomico-with-typescript/meta-types/method-declaration.md), this is useful for associating meta-types to the customElement instance when using JSX or TSX.

### Host to declare events

Host will be useful for you to declare your event using JSX or TSX regardless of its origin, example:

```tsx
import { Host, c, useEvent } from "atomico";

function myComponent(): Host<{
  onMyCustomEvent: Event
}> {
  const dispatch = useEvent("MyCustomEvent");
  return <host>
      <button onclick={dispatch}>click</button>
  </host>;
}

export const MyComponent = c(myComponent);
```

The use of Host allows that when using JSX or TSX your event is validated through Typescript, this also applies when using @atomico/react, example:&#x20;

```tsx
import { MyComponent } from "my-componnet";

<MyComponent
  onMyCustomEvent={(event) => {
    event.currentTarget; //  < MyComponent
  }}
></MyComponent>;
```

> Note event.currentTarget accesses the CustomElement, example properties and more.

That has another benefit, capturing the event as a type to be used in an external handler, example:

```typescript
function handlerMyCustomEvent(
  event: DOMEvent<"MyCustomEvent", typeof MyComponent>
) {
  event.currentTarget; //  < MyComponent
}
```


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